Cluster superconductivity in the magnetoelectric Pb(Fe.sub.1/2./sub.Sb.sub.1/2./sub.)O.sub.3./sub. ceramics

0479506 - FZÚ 2018 RIV PL eng J - Journal Article
Laguta, Valentyn - Maryško, Miroslav - Stephanovich, V. A. - Raevsky, I.P. - Olekhnovich, N.M. - Pushkarev, A.V. - Radyush, Yu.V. - Raevskaya, S. I. - Kuzian, R. O. - Chlan, V. - Štěpánková, H.
Cluster superconductivity in the magnetoelectric Pb(Fe_1/2Sb_1/2)O₃ ceramics.
Acta Physica Polonica A. Roč. 131, č. 6 (2017), s. 1534-1539. ISSN 0587-4246. E-ISSN 1898-794X
R&D Projects: GA MŠMT LO1409; GA MŠMT LM2015088; GA ČR GA13-11473S
Institutional support: RVO:68378271
Keywords : multiferroics * superconductivity
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 0.857, year: 2017

The observation of cluster (local) superconductivity in the magnetoelectric Pb(Fe1/2Sb1/2)O3 ceramics prepared at a hydrostatic pressure of 6 GPa and temperatures 1200-1800 K to stabilize the perovskite phase is reported for the first time. The superconductivity is manifested by an abrupt drop of the magnetic susceptibility at the critical temperature TC = 7 K. Both the magnitude of this drop and TC decrease with magnetic field increase. Similarly, the low-field paramagnetic absorption measured by EPR spectrometer drops significantly below TC as well. The observed effects and their critical magnetic field dependence are interpreted as manifestation of the superconductivity and Meissner effect in metallic Pb nanoclusters existing in the ceramics.
Permanent Link: http://hdl.handle.net/11104/0275490